Antelope Horn Milkweed
Antelope Horn Milkweed
–
Asclepias asperula
Milkweed, Antelope Horn, Spider Milkweed, Green-flowered Milkweed
6
–
12 inches
1
–
3 feet
Western U.S., northern Mexico
Central Texas
Texas
Full Sun
Part Sun/Shade
Very Low
Flowering
Attracts Pollinators
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About This Plant
Sun or partial sun. A clump-forming deciduous perennial, up to 24 inches. Big flowerheads appear throughout the warm season, followed by green seed follicles that curve as they lengthen hence the common name: antelope horns. The thick leaves are long, narrow and folded lengthwise, somewhat resembling their close relative, tropical milkweed.
A roadside weed in the Blackland Prairie and Edwards Plateau, this species is becoming harder to find due to local development and roadside mowing. Milkweeds are the only food source for monarch butterfly caterpillars.
Although robust, antelope horn is difficult to propagate in a greenhouse setting, so it’s uncommon at commercial nurseries; preserve it if you have it on-site.
Maintenance
None required, beyond the care needed to establish it in its preferred setting — weedy roadsides and inferno strips. Aphids are likely to infest any milkweed, but they aren’t really a problem. They can be sprayed off with soapy water. Treating aphids will (obviously) wipe out the monarch caterpillars too.
Features
Plant Type:
Perennial
Size:
6-12" H, 1-3' W
Sunlight Requirements:
Full Sun, Part Sun/Shade
Soil Types:
Clay, Sandy, Thin
Wildlife:
Bees, Butterflies, Butterfly Larvae, Pollinators
Flower Color:
Cream, Green, White
Bloom Time:
May, June, July, August, September, October
Freeze Hardy:
Yes
Invasive:
No
Caution:
None
Coupon Eligible:
This plant goes well with
Castilleja indivisa
Asclepias curassavica
Conoclinium greggii
Phyla nodiflora
Solidago sp.
Asclepias oenotheroides
Engelmannia peristenia
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